Greene is suspected in the killing of a Des Moines police officer and an Urbandale police officer earlier Wednesday.

Shortly after 1 a.m. local time, officers responded to a report of shots fired in the suburb of Urbandale, a few miles from Des Moines. They found an Urbandale Police Department officer who had been fatally shot sitting alone in his patrol vehicle, police said.

Minutes later, officers found a Des Moines Police Department police officer who had also been shot in his patrol car at an intersection. The wounded officer was transported to a local hospital where he died, police said.

“In all appearances it looks just like that, the officers were ambushed,” Sgt. Paul Parizek of the Des Moines Police Department said at a press conference this morning. “On the surface right now, like I said, we are just a few hours into this. It doesn’t look like there was any interaction between these officers and whoever the coward is who shot that while they sat in their cars.”

Parizek expressed grave concern for the safety of police officers in the area.

“There is clearly danger if you are a police officer. These guys were gunned down, sitting in their car, doing nothing wrong,” he said. “So there is definitely some danger out there, there is someone out there shooting police officers. We hope we find him before anyone else gets hurt. We definitely don’t want anyone in the public or in the community to get hurt, but there is a clear and present danger to police officers right now.”

Parizek said the law enforcement agency has doubled up its officers on patrol in the meantime.

“We are very well aware that the society that we are living in right now and the time, there are some not so positive views of law enforcement that a certain segment of our population holds. So we are as vigilant as we can be and still provide the service we need to provide,” Parizek told reporters.

There was no radio traffic between the fallen officers and dispatch during the shootings, police said. It is unclear if the officers were equipped with dashboard or body cameras at the time they were shot.